This is one of the best purchases I have made in the last couple of years. Being a fan of sparkling water, I would buy so many 2 liter bottles at the store. I would also purchase lots of the canned seltzer or club soda at the local grocery store and it could get costly and it was also heavy to carry. Now that I make my own soda, all I need is water and my carbonator. I probably drink at least a half of gallon of sparkling water a day, so this is a godsend. The soda maker uses 1 liter bottles, so I keep 4 on hand so that I always have cold, sparkling water. I also make different flavored sodas for the family. There are so many flavors to choose from and everybody likes them. This product is environmentally friendly, since there are no bottles or cans to toss, and it is cheaper to make your own soda, rather than buy it. I LOVE this machine and will always keep one on hand. It's also user friendly, so anyone can use it.